﻿<p>The <em>IfcIndexedPolygonalFace</em> is a compact representation of a planar face being part of a face set.</em> The vertices of the polygonal planar face are provided by 3 or more Cartesian points, defined by indices that point into an <em>IfcCartesianPointList3D</em>, either direcly, or via the <i>PnIndex</i>, if provided at <em>IfcPolygonalFaceSet</em>.</p>
<p>Figure 3 shows an <em>IfcIndexedPolygonalFace</em> at an <em>IfcPolygonalFaceSet</em> not using <i>PnIndex</i> (the default).</p>
<table summary="tessellation">
 <tr><td style="width: 600px"><img src="../../../figures/ifcindexedpolygonalface_01.png" alt="IfcIndexedPolygonalFace">
 </td>
 </tr>
 <tr>
  <td><p class="figure">Figure 3 &mdash; Polygonal face geometry provided by indices into a point list</p></td>
 </tr>
</table>
<p>&nbsp;</p>
<p>Figure 4 shows an <em>IfcIndexedPolygonalFace</em> at an <em>IfcPolygonalFaceSet</em> using <i>PnIndex</i>.</p>
<table summary="tessellation">
 <tr><td style="width: 600px"><img src="../../../figures/ifcindexedpolygonalface_02.png" alt="IfcIndexedPolygonalFace us
ing PnIndex">
 </td>
 </tr>
 <tr>
  <td><p class="figure">Figure 4 &mdash; Polygonal face geometry provided by indices into a point list</p></td>
 </tr>
</table>

<blockquote class="history">HISTORY&nbsp; New entity in IFC4 Addendum 2.</blockquote>